Of the City Sewerage.
As yet I have spoken only of the sewers of London[64] “without the City;” but the sewers within the City, though connected, for the general public drainage and sewerage of the capital, with the works under the control of the Metropolitan Commissioners, are in a distinct and strictly defined jurisdiction, superintended by City Commissioners, and managed by City officers, and consequently demand a special notice.
The account of the City sewers, however, may be given with a comparative brevity, for the modes of their construction, as well as their general management, do not differ from what I have described as pertaining to the extra-civic metropolis. There are, nevertheless, a few distinctions which it is proper to point out.
The City sewers are the oldest in the capital, for the very plain reason that the City itself, in its site, if not now in its public and private buildings, is the oldest part of London, as regards the abode of a congregated body of people.
The ages (so to speak) of these sewers, vary, for the most part, according to the dates of the City’s rebuilding after the Great Fire, and according to the dates of the many alterations, improvements, removal or rebuilding of new streets, markets, &c., which have been effected since that period. Before the Great Fire of 1666, all drainage seems, with a few exceptions, to have been fortuitous, unconnected, and superficial.
The first public sewer built after this important epoch in the history of London was in Ludgate-street and hill. This was the laudable work of the Dean and Chapter of St. Paul’s, and was constructed at the instance, it is said, and after the plans, of Sir Christopher Wren. There is, perhaps, no official or documentary proof of this, for the proclamations from the King in council, the Acts of Parliament, and the resolutions of the Corporation of the City of London at that important period, are so vague and so contradictory, and were so frequently altered or abrogated, and so frequently disregarded, that it is more impossible than difficult to get at the truth. Of the fact which I have just mentioned, however, there need be no doubt; nor that the second public City sewer was in Fleet-street, commenced in 1668, the second year after the fire.
There are, nevertheless, older sewers than this, but the dates of their construction are not known; we have proof merely that they existed in old London, or as it was described by an anonymous writer (quoted, if I remember rightly, in Maitland’s “History of London”), London “ante ignem”—London before the fire. These sewers, or rather portions of sewers, are severally near Newgate, St. Bartholomew’s Hospital sewer, and that of the Irongate by the Tower.
The sewer, however, which may be pointed out as the most remarkable is that of Little Moorgate, London-wall. It is formed of red tiles; and from such being its materials, and from the circumstance of some Roman coins having been found near it, it is supposed by some to be of Roman construction, and of course coeval with that people’s possession of the country. This sewer has a flat bottom, upright sides, and a circular arch at its top; it is about 5 feet by 3 feet. The other older sewers present much about the same form; and an Act in the reign of Charles II. directs that sewers shall be so built, but that the bottom shall have a circular curve.
I am informed by a City gentleman—one taking an interest in such matters—that this sewer has troubled the repose of a few civic antiquaries, some thinking that it was a Roman sewer, while others scouted such a notion, arguing that the Romans were not in the habit of doing their work by halves; and that if they had sewered London, great and enduring remains would have been discovered, for their main sewer would have been a solid construction, and directed to the Thames, as was and is the Cloaca Maxima, in the Eternal City, to the Tiber. Others have said that the sewer in question was merely built of Roman materials, perhaps first discovered about the time, having originally formed a reservoir, tank, or even a bath, and were keenly appropriated by some economical or scheming builder or City official.
“That the Britons,” says Tacitus in his “Life of Agricola,” “who led a roaming life, and were easily incited to war, might contract a love for peace, by being accustomed to a pleasanter mode of life, Agricola assisted them to build houses, temples, and market-places. By praising the diligent and upbraiding the idle, he excited such emulation among the Britons, that, after they had erected all those necessary buildings in their towns, they built others for pleasure and ornament, as porticoes, galleries, baths, and banqueting-houses.”
The sewers of the city of London are, then, a comparatively modern work. Indeed, three-fourths of them may be called modern. The earlier sewers were—as I have described under the general head—ditches, which in time were arched over, but only gradually and partially, as suited the convenience or the profit of the owners of property alongside those open channels, some of which thus presented the appearance of a series of small uncouth-looking bridges. When these bridges had to be connected so as to form the summit of a continuous sewer, they presented every variety of arch, both at their outer and under sides; those too near the surface had to be lowered. Some of these sewers, however, were in the first instances connected, despite difference of size and irregularity of form. The result may be judged from the account I have given of the strange construction of some of the Westminster sewers, under the head of “subterranean survey.”
How modern the City sewers are may best be estimated from the following table of what may be called the dates of their construction. The periods are given decennially as to the progress of the formation of new sewers:—
| Feet. | ||
| 1707 to 1717 | 2,805 | |
| 1717 „ 1727 | 2,110 | |
| 1727 „ 1737 | 2,763 | |
| 1737 „ 1747 | 1,238 | |
| 1747 „ 1757 | 3,736 | |
| 1757 „ 1767 | 3,736 | |
| 1767 „ 1777 | 7,597 | |
| 1777 „ 1787 | 8,693 | |
| 1787 „ 1797 | 3,118 | |
| 1797 „ 1807 | 5,116 | |
| 1807 „ 1817 | 5,097 | |
| 1817 „ 1827 | 7,847 | |
| 52,810 | ||
| 1827 to 1837 | 39,072 | feet. |
| 1837 to 1847 | 88,363 | „ |
| 127,435 |
Thus the length made in the 20 years previous to 1847 was more than double all that was made during the preceding 120 years; while in the ten years from 1837 to 1847, the addition to the lineal extent of sewerage was very nearly equal to all that had been made in 130 years previously.
This addition of 127,435 feet, or rather more than 24 miles, seems but a small matter when “London” is thought of; but the reader must be reminded that only a small portion (comparatively) of the metropolis is here spoken of, and the entire length of the City sewerage, at the close of 1847, was but 44 miles; so that the additions I have specified as having been made since 1837, were more than one-half of the whole. The re-constructions are not included in the metage I have given, for, as the new sewers generally occupied the same site as the old, they did not add to the length of the whole.
The total length of the City sewerage was, on the 31st December, 1851, no less than 49 miles; while the entire public way was at the same recent period, 51 miles (containing about 1000 separate and distinct streets, lanes, courts, alleys, &c., &c.); and I am assured that in another year or so, not a furlong of the whole City will be unsewered.
The more ancient sewers usually have upright walls, a flat or slightly-curved invert, and a semicircular or gothic arch. The form of such as have been built apparently more than 20 years ago, is that of two semicircles, of which the upper has a greater radius, connected by sloping side walls; those of recent construction are egg-shaped. The main lines are not unfrequently elliptic; in the case of the Fleet, and other ancient affluents of the Thames, the forms and dimensions vary considerably. Instances occur of sewers built entirely of stone; but the material is almost invariably brick, most commonly 9 inches in substance; the larger sewers 14, and sometimes 18 inches.
The falls or inclinations in the course of the City sewerage vary greatly, as much as from 1 in 240 to 1 in 24, or, in the first case, from a fall of 22 feet, in the latter, of course, to ten times such fall, or 220 feet per mile. There are, moreover, a few cases in which the inclination is as small as 1 in 960; others where it is as high as 1 in 14. This irregularity is to be accounted for, partly by the want of system in the old times, and partly from the natural levels of the ground. The want of system and the indifference shown to providing a proper fall, even where it was not difficult, was more excusable a few years back than it would be at the present time, for when some of these sewers were built, the drainage of the house-refuse into them was not contemplated.
The number of houses drained into the City sewers is, as precisely as such a matter can be ascertained, 11,209; the number drained into the cesspools is 5030. This shows a preponderance of drainage into the sewers of 6179. The length of the house-drains in the City, at an average of 50 feet to each house, may be estimated at upwards of 106 miles. These City drains are included in the general computation of the metropolis.
The gully-drains in the City are more frequent than in other parts of the metropolis, owing to the continual intersection of streets, &c., and perhaps from a closer care of the sewerage and all matters connected with it. The general average of the gully-drains I have shown to be 59 for every mile of street. I am assured that in the City the street-drains may be safely estimated at 65 to the mile. Estimating the streets gullied within the City, then, at an average of 50 miles, or about a mile more than the sewers, the number of gully-drains is 3250, and the length of them about 50 miles; but these, like the house-drains, have been already included in the metropolitan enumeration.
The actual sum expended yearly upon the construction, and repairs, and improvements of the City sewers cannot be cited as a distinct item, because the Court makes the return of the aggregate annual expenditure, as regards pavement, cleansing, and the matters specified as the general expenditure under the Court of Commissioners of the City Sewers. The cost, however, of the construction of sewers comprised within the civic boundaries is included in the general metropolitan estimate before given.